I have done scuba diving for decades and the water temp where I live in Monterey, CA runs from 48-54 degrees throughout the year. My hands and feet would get cold until I invested in a drysuit that kept my body a lot wamer as my body was not having to warm up the 48 degree water that got inside my wetsuits by 50 degrees to my body temperature. The human body had natural mechanism to protect the core when it is too cold and that consists of shunting off the blood flow to the hands and feet and then the head. With the dry suit my core was warmer and so I had more blood flow to my hands and feet. Wearing same hood and gloves my hands and heat stayed warmer as a result of my core being warmer. Same applies to wading chest deep in cold water. Keep the core warmer and unless you are standing on ice your feet will stay much warmer.
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